body{font-family:system-ui,Arial,sans-serif;margin:0;background:#fff;color:#14202a}main{max-width:720px;margin:auto;padding:32px}button,input{font:inherit;padding:8px;margin:4px}a{margin-right:12px}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #2563eb}@media (max-width:640px){main{padding:16px}}